tsconfig.json

{
    "compilerOptions": {
      /* Basic Options */                       
      "target": "es5",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
      "allowJs": true,                       /* Allow JavaScript files to be compiled. */
      "checkJs": true,                       /* Report errors in .js files. */
      "declaration": true,                   /* Generates corresponding '.d.ts' file. */
      "sourceMap": true,                     /* Generates corresponding '.map' file. */
      "outDir": "./assets/",                 /* Redirect output structure to the directory. */
      "rootDir": "./_prebuilt-assets/ts/",   /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
      "removeComments": true,                /* Do not emit comments to output. */
      "noEmit": true,                        /* Do not emit outputs. */
      "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
      "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
      
      /* Strict Type-Checking Options */        
      "strict": true,                        /* Enable all strict type-checking options. */
      "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
      "strictNullChecks": true,              /* Enable strict null checks. */
      "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
      "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
  
      /* Additional Checks */                   
      "noUnusedLocals": true,                /* Report errors on unused locals. */
      "noUnusedParameters": true,            /* Report errors on unused parameters. */
      "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
      "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */

      /* Source Map Options */                  
      "sourceRoot": "./_prebuilt-assets/ts/",/* Specify the location where debugger should locate TypeScript files instead of source locations. */
      "mapRoot": "./_prebuilt-assets/ts/",
    }
  }